EP0339335B1 - Luftreifen - Google Patents

Luftreifen Download PDF

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Publication number
EP0339335B1
EP0339335B1 EP89106168A EP89106168A EP0339335B1 EP 0339335 B1 EP0339335 B1 EP 0339335B1 EP 89106168 A EP89106168 A EP 89106168A EP 89106168 A EP89106168 A EP 89106168A EP 0339335 B1 EP0339335 B1 EP 0339335B1
Authority
EP
European Patent Office
Prior art keywords
tire
subgrooves
main grooves
tread
tread surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89106168A
Other languages
English (en)
French (fr)
Other versions
EP0339335A3 (en
EP0339335A2 (de
Inventor
Toshihiko Suzuki
Kenichi Shirai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Publication of EP0339335A2 publication Critical patent/EP0339335A2/de
Publication of EP0339335A3 publication Critical patent/EP0339335A3/en
Application granted granted Critical
Publication of EP0339335B1 publication Critical patent/EP0339335B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/0306—Patterns comprising block rows or discontinuous ribs

Definitions

  • the present invention relates to a pneumatic tire and more particularly to a pneumatic tire improved in dry performance, particularly dry threshold performance, while maintaining the wet performance.
  • a pneumatic tire for passenger cars having a tread pattern formed on a tread surface and comprising a plurality of main grooves extending in the center region of said tread surface towards the circumferential direction of the tire and a plurality of subgrooves extending so as to cross said plurality of main grooves in a substantially straight manner, wherein said main grooves are each substantially straight forward in the circumferential direction of the tire, said subgrooves each have a bent groove portion in each shoulder region located outside the outermost main groove, such that the groove parts on either side of the bent portion are inclined at different angles with respect to the width direction of the tire, wherein the subgrooves cross said main grooves in opposite directions of inclination in the left and right half portions, respectively, of the tread from the tire equator line as the center line, wherein the percentage groove area of the whole grooves including said main grooves and said subgrooves relative to the area of the whole tread surface is 30 to 40 %, and the opening angle
  • dry performance of a pneumatic tire is intended to mean the traction and driveability during traveling on a dry road surface.
  • dry threshold performance is intended to mean the threshold cornering force caused during cornering which serves as a measure of the driveability of the tire.
  • wet performance of a pneumatic tire is intended to mean the traction and driveability during traveling on a wet road surface. The wet performance is greatly influenced by the ability of main grooves and subgrooves provided on the tread surface of reject water.
  • a lowering in the groove area occupied by the main grooves and subgrooves on the tread surface is useful for improving the dry performance of a pneumatic tire.
  • the lowering in the percentage groove area brings about a problem with a lowering in the wet performance due to a lowering in the ability to reject water.
  • the percentage groove area of the tread surface was limited to 30 to 40% for the purpose of offering a balance between the dry performance and the wet performance.
  • An object of the present invention is to provide a pneumatic tire, particularly a pneumatic tire for a passenger car, improved in the dry performance while maintaining the wet performance.
  • Another object of the present invention is to provide a pneumatic tire for a passenger car remarkably improved particularly in the dry threshold performance while maintaining the wet performance.
  • the above-described subgrooves are each bent in a wedge form in both shoulder regions respectively located outside the outermost main grooves to form a bent groove portion.
  • the wedge-shaped bent groove portion formed in each shoulder region enables excellent ability to reject water to be maintained despite a reduction in the percentage groove area and the number of pitches, which makes it possible to ensure excellent wet performance.
  • the above-described wedge-shaped bent groove portion increase the rigidity of the block in the shoulder region and enables a further remarkable improvement in the dry threshold performance.
  • the tread surface of a pneumatic tire shown in Fig. 1 has four main grooves 1 substantially straightforward in the circumferential direction of the tire. Further, a number of subgrooves 2 are symmetrically provided about the equator E of the tread surface. These subgrooves 2 extend from the center region of the tread surface respectively towards the right and left shoulder regions and straightly cross the above-described main grooves 1. These subgrooves 2 are provided at a predetermined pitch in the circumferential direction of the tire. Although the pitch may be constant, it is preferred that the subgrooves are provided in a combination of different several kinds of pitches. A number of blocks 3 are formed on the tread surface through crossing between the plurality of main grooves 1 and the subgrooves 2. A rib 4 is formed between two main grooves 1 located inside the tread surface.
  • the percentage groove area S of the whole grooves including the above-described main grooves 1 and subgrooves 2 relative to the area of the whole tread surface is limited to a relatively small range, i.e., 20 to 30%.
  • the number of pitches, P, at which the circumferential direction of the tire is divided by a number of subgrooves 2 is also limited to a relatively small range, i.e., 30 to 45.
  • the limitations of the percentage groove area S and the number of pitches, P, respectively to the above-described relatively small ranges brings about an increase in the rigidity through an increase in the size of each block, which contributes to an improvement in the dry performance of the tire.
  • the increase in the rigidity brings about an increase in the cornering force during cornering, which contributes to a remarkable improvement in the dry threshold performance.
  • the subgrooves 2 are bent each in a wedge form at portions extending to blocks 3 of the shoulder portions located on the outermost side to form a bent groove portion 2a within the blocks 3.
  • the wedge-shaped bent groove portions 2a serve to maintain excellent ability to reject water despite the above-described reduction in the percentage groove area S and the number of pitches, P.
  • the above-described bent groove portions 2a contribute to an improvement in the ability to reject water during cornering and prevents the wet performance during cornering from lowering.
  • the bent groove portions 2a further increase the block rigidity of the outermost shoulder portions, the dry threshold performance can be further improved.
  • the opening angle ⁇ of the bent groove portion is limited on the side having a smaller angle to 130 to 160°.
  • the opening angle ⁇ is larger than 160°, the effect of maintaining excellent ability to reject water is lowered, while when the opening angle is smaller than 130°, the effect of improving the rigidity of the blocks 3 is lowered.
  • the opening angle ⁇ is defined by an angle made by both lines formed by connecting the center of the groove of the bent groove portion 2a to the center of the subgroove at both end portions of the block 3 extending from the bent groove portion 2a to both sides thereof.
  • a notch is provided at the end portion of the block as shown in Fig. 1, the center of the width of the subgroove on an assumption that there is no notch is regarded as the center of the subgroove.
  • the distance B from the equator E to the bent groove portion 2a shown in Fig. 1 it is preferred to limit the distance B from the equator E to the bent groove portion 2a shown in Fig. 1 to 80 to 90% of a half-length, C, of the ground contacting width of the tread. More preferably, besides the position of the above-described bent groove portion 2a, the distance A from the equator E to the main groove 1 located on the outermost side is preferably limited to 75% or less of a half-length C of the ground contacting width of the tread.
  • the subgrooves 2 may be discontinuous at a portion between two innermost grooves 1, i.e., at a portion between two main grooves 1 sandwiching the equator E.
  • the subgrooves 2 may be connected to each other.
  • the subgrooves 2 should be continuous from the center region of the tread to the end portions of the shoulder portions. It is preferred that the subgrooves 2 be substantially straight. It is noted in this connection that the subgrooves may be in a slightly curved straight form as shown in Fig. 1 or a completely straight form as shown in Fig. 2.
  • the main grooves 1 each have a groove width of 6 to 12 mm and a groove depth of 5 to 8 mm while the subgrooves 2 each have a groove width of 3 to 6 mm and a groove depth of 5 to 8 mm.
  • the block rigidity is increased, which contributes to an improvement in the dry performance.
  • radial tires i.e., a tire of the present invention, a conventional tire and a comparative tire, respectively having the following structures were prepared.
  • tire size 205/55R16 tread pattern: Fig. 2 percentage groove area: 26% number of pitches: 33 position of main groove provided on the outermost side (A/C): 70% position of bent groove portion (B/C): 90% opening angle of bent groove portion: 145°
  • tire size the same as that of the tire of the present invention tread pattern: Fig. 3 percentage groove area: 34% number of pitches: 60 position of main groove provided on the outermost side (A/C): 80%
  • tire size the same as that of the tire of the present invention tread pattern: Fig. 4 percentage groove area: the same as that of the tire of the present invention number of pitches: 34 position of main groove provided on the outermost side (A/C): the same as that of the conventional tire
  • the directions of the inclination of the subgrooves 2 are alternately varied at intersections of the main grooves and the subgrooves 2, as opposed to the tire of the present invention shown in Fig. 2 which has a bent groove portion 2a within a block 3 in the outermost shoulder region.
  • the comparative tire has substantially the same tread pattern as that of the conventional tire.
  • the percentage groove area is the same as that of the tire of the present invention, and the number of pitches is substantially the same as that of the tire of the present invention.
  • each tire was mounted on an actual vehicle.
  • the vehicle was travelled in a circuit by five test drivers, and the cornering threshold performance was graded by feeling of the test drivers on the basis of 10 points.
  • the average value of the points determined by the five test drivers were regarded as the dry threshold performance.
  • the dry threshold performance was expressed in terms of an index calculated by assuming the dry threshold performance of the conventional tire to be 100.
  • each tire was mounted on an actual vehicle and whirlingly travelled around a circle having a radius of 30 m drawn on a wet road having a water depth of about 4 mm to measure the threshold lateral acceleration.
  • the value of the threshold lateral acceleration was regarded as the wet performance during cornering.
  • the wet performance was expressed in terms of an index calculated by assuming the wet performance of the conventional tire to be 100.
  • Tire of the present invention Conventional tire Comparative tire dry threshold performance 120 100 108 wet performance 101 100 92
  • Example 6 Five types of radial tires were prepared which have the same structure as that of the tire of the present invention in Example 1, except that only the number of pitches was varied to 20, 30, 45, 50, and 60.
  • the respective radial tires were subjected to the tests of the dry threshold performance and the wet performance during cornering by the same measuring methods as those employed in Example 1.
  • the results of the measurement were expressed in terms of an index calculated by assuming the measurements of the conventional tire of Example 1 to be 100, and the results are shown in Fig. 6.
  • the tire of the present invention wherein the number of pitches was limited to 30 to 45 had improved dry threshold performance while maintaining the wet performance comparable to that of the conventional tire.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Claims (4)

  1. Druckluftreifen für Personenkraftwagen mit einem Profilmuster, welches auf einer Lauffläche ausgebildet ist und eine Mehrzahl von Hauptnuten (1) aufweist, die sich im zentralen Bereich der Lauffläche in Umfangsrichtung des Reifens erstrecken, und eine Mehrzahl von Nebennuten (2) aufweist, die sich so erstrecken, daß sie die Mehrzahl von Hauptnuten (1) im wesentlichen gerade durchkreuzen, wobei die Hauptnuten jeweils im wesentlichen in Umfangsrichtung des Reifens gerade vertaufen, die Nebennuten jeweils einen Nutbiegungsabschnitt (2a) in dem jeweiligen Schulterbereich außerhalb der am weitesten außen liegenden Hauptnut haben, so daß die Nutteile auf jeder Seite des Biegungsabschnittes (2a) unter unterschiedlichen Winkeln bezüglich der Breitenrichtung des Reifens geneigt sind, wobei die Nebennuten (2) die Hauptnuten (1) in den linken bzw. rechten Hälften der Lauffläche, ausgehend von dem Reifenäquator als der Zentrallinie, unter entgegengesetzten Neigungsrichtungen schneiden, dadurch gekennzeichnet, daß der Prozentsatz der Nutfläche aller Nuten (1, 2) einschließlich der Hauptnuten (1) und der Nebennuten (2) relativ zu der gesamten Fläche der Lauffläche 20 bis 30 % betragt, daß die Anzahl der Abschnitte, in welche die Umfangsrichtung des Reifens durch die Mehrzahl von Nebennuten (2) geteilt wird, 30 bis 45 beträgt, daß die Teile bzw. Abschnitte der Nebennuten auf jeder Seite des Nutbiegungsabschnittes (2a) bezüglich einer Tangente an den Nutbiegungsabschnitt in der radialen Ebene auf derselben Seite liegen, daß der Abstand (B) von dem Äquator (E) der Lauffläche zu dem Nutbiegungsabschnitt (2a) 80 bis 90 % der Hälfte der Bodenkontaktbreite (C) der Lauffläche beträgt und daß der Öffnungswinkel (ϑ) des Nutbiegungsabschnittes (2a) auf derjenigen Seite, die den kleineren Winkel hat, 130° bis 160° beträgt.
  2. Druckluftreifen nach Anspruch 1, dadurch gekennzeichnet, daß der Abstand von dem Äquator der Lauffläche zu der am weitesten außen liegenden Hauptnut 75 % der Hälfte der Bodenkontaktbreite der Lauffläche oder weniger beträgt.
  3. Druckluftreifen nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß die Hauptnuten und die Nebennuten bezüglich des Äquators der Lauffläche beide symmetrisch vorgesehen sind.
  4. Druckluftreifen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hauptnuten jeweils eine Breite von 6 bis 12 mm und eine Tiefe von 5 bis 8 mm haben und daß die Nebennuten jeweils eine Breite von 3 bis 6 mm und eine Tiefe von 5 bis 8 mm haben.
EP89106168A 1988-04-28 1989-04-07 Luftreifen Expired - Lifetime EP0339335B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63104030A JP2650040B2 (ja) 1988-04-28 1988-04-28 乗用車用空気入りタイヤ
JP104030/88 1988-04-28

Publications (3)

Publication Number Publication Date
EP0339335A2 EP0339335A2 (de) 1989-11-02
EP0339335A3 EP0339335A3 (en) 1990-05-23
EP0339335B1 true EP0339335B1 (de) 1995-07-19

Family

ID=14369845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89106168A Expired - Lifetime EP0339335B1 (de) 1988-04-28 1989-04-07 Luftreifen

Country Status (4)

Country Link
US (1) US4986324A (de)
EP (1) EP0339335B1 (de)
JP (1) JP2650040B2 (de)
DE (1) DE68923478T2 (de)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2821886B2 (ja) * 1988-08-27 1998-11-05 横浜ゴム株式会社 ライトトラック用空気入りタイヤ
JPH0657485B2 (ja) * 1989-03-27 1994-08-03 株式会社ブリヂストン ラジアルタイヤ対
DE9002986U1 (de) * 1990-03-12 1991-04-04 Uniroyal Englebert Reifen GmbH, 5100 Aachen Fahrzeugluftreifen
JPH03295707A (ja) * 1990-04-13 1991-12-26 Bridgestone Corp 空気入りラジアルタイヤ
DE9016454U1 (de) * 1990-12-04 1991-07-25 Uniroyal Englebert Reifen GmbH, 5100 Aachen Fahrzeugluftreifen
JP3057381B2 (ja) * 1991-04-11 2000-06-26 横浜ゴム株式会社 乗用車用空気入りラジアルタイヤ
JP2767502B2 (ja) * 1991-04-12 1998-06-18 横浜ゴム株式会社 乗用車用空気入りラジアルタイヤ
JP3020182B2 (ja) * 1991-04-12 2000-03-15 横浜ゴム株式会社 乗用車用空気入りラジアルタイヤ
JP3020184B2 (ja) * 1991-07-08 2000-03-15 横浜ゴム株式会社 乗用車用空気入りラジアルタイヤ
US5385188A (en) * 1992-04-29 1995-01-31 The Yokohama Rubber Co., Ltd. Pneumatic radial tire for passenger cars
DE69301081T2 (de) * 1992-10-14 1996-06-13 Sumitomo Rubber Ind Luftreifen
US5595619A (en) * 1992-10-14 1997-01-21 Sumitomo Rubber Industries, Ltd. Pneumatic tire including shoulder parts
JP2644970B2 (ja) * 1993-12-27 1997-08-25 住友ゴム工業株式会社 空気入りタイヤ
US5964267A (en) * 1994-05-10 1999-10-12 Uniroyal Englebert Reifen Gmbh Tread configuration
AT403560B (de) * 1994-12-09 1998-03-25 Semperit Ag Fahrzeugluftreifen mit einem profilierten laufstreifen
AT403455B (de) * 1994-12-21 1998-02-25 Semperit Ag Fahrzeugreifen mit einem drehrichtungsgebunden ausgebildeten laufstreifenprofil
IT1275552B (it) * 1995-07-14 1997-08-07 Pirelli Pneumatico polivalente per autoveicoli
IT1276118B1 (it) * 1995-11-13 1997-10-24 Pirelli Pneumatico per autoveicoli con disegno battistrada particolarmente adatto per la marcia su fondi innevati
JPH09156316A (ja) * 1995-12-04 1997-06-17 Yokohama Rubber Co Ltd:The 空気入りラジアルタイヤ
USD380427S (en) * 1996-01-17 1997-07-01 The Goodyear Tire & Rubber Company Tire tread
US5733393A (en) * 1996-01-17 1998-03-31 The Goodyear Tire & Rubber Company Tire having good diverse properties
USD385241S (en) * 1996-08-19 1997-10-21 The Goodyear Tire & Rubber Company Tire tread
USD384923S (en) * 1996-08-19 1997-10-14 The Goodyear Tire & Rubber Company Tire tread
USD386730S (en) * 1996-11-06 1997-11-25 The Goodyear Tire & Rubber Company Tire tread
USD433355S (en) * 1999-10-19 2000-11-07 The Goodyear Tire & Rubber Company Tire tread
USD429667S (en) * 1999-12-16 2000-08-22 The Goodyear Tire & Rubber Company Tire tread
US6435237B1 (en) 2000-06-14 2002-08-20 The Goodyear Tire & Rubber Company Pneumatic tire having generally rounded footprint shape
US6439285B1 (en) 2000-06-14 2002-08-27 The Goodyear Tire & Rubber Company Pneumatic tire having 98 pitches
US6446689B1 (en) 2000-06-14 2002-09-10 The Goodyear Tire & Rubber Company Pneumatic tire having 80 to 105 pitches
JP4114713B2 (ja) * 2001-11-30 2008-07-09 横浜ゴム株式会社 空気入りタイヤ
KR20040037632A (ko) * 2002-10-29 2004-05-07 금호타이어 주식회사 미니그루브를 갖는 중하중용 공기입 레디알 타이어
JP3678727B2 (ja) * 2003-01-07 2005-08-03 住友ゴム工業株式会社 空気入りタイヤ
EP1580035B1 (de) * 2004-03-26 2007-05-30 Continental Aktiengesellschaft Fahrzeugluftreifen
JP5020314B2 (ja) * 2007-05-11 2012-09-05 東洋ゴム工業株式会社 空気入りタイヤ
JP5291739B2 (ja) * 2011-03-02 2013-09-18 住友ゴム工業株式会社 空気入りタイヤ
JP5387707B2 (ja) * 2012-03-14 2014-01-15 横浜ゴム株式会社 空気入りタイヤ
CN104870218B (zh) * 2012-12-20 2017-02-22 普利司通美国轮胎运营有限责任公司 轮胎换热特征结构
TW201437062A (zh) * 2013-03-18 2014-10-01 Shuang Qi Entpr Co Ltd 輪胎結構
JP5928524B2 (ja) * 2014-05-20 2016-06-01 横浜ゴム株式会社 空気入りタイヤ
JP1547886S (de) * 2015-10-14 2016-04-18
CN108189624A (zh) * 2018-02-09 2018-06-22 建大橡胶（中国）有限公司 一种运动型花纹轮胎
DE102019208593A1 (de) * 2019-06-13 2020-12-17 Continental Reifen Deutschland Gmbh Fahrzeugluftreifen

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US4299264A (en) * 1979-04-12 1981-11-10 Dunlop Limited Tires
US4456046A (en) * 1981-05-11 1984-06-26 Miller Timothy I High-speed tires
BE889969A (fr) * 1981-08-13 1981-12-01 Goodyear Tire & Rubber Pneumatique
JPS6045404A (ja) * 1983-08-24 1985-03-11 Bridgestone Corp ウェットスキッド抵抗性の高い乗用車用タイヤのトレッドパターン
JPS60169305A (ja) * 1984-02-13 1985-09-02 Ohtsu Tire & Rubber Co Ltd 車両用タイヤのトレツド構造
JPS6171203A (ja) * 1984-09-17 1986-04-12 Bridgestone Corp 空気入りラジアルタイヤ
JPS6222103U (de) * 1985-07-25 1987-02-10
JPS62255203A (ja) * 1986-04-30 1987-11-07 Bridgestone Corp 空気入りラジアルタイヤ
JPS6390405A (ja) * 1986-10-03 1988-04-21 Bridgestone Corp 空気入りラジアルタイヤのパタ−ン
US4807679A (en) * 1987-06-11 1989-02-28 The Goodyear Tire & Rubber Company Pneumatic tire tread having sipes
EP0299766B1 (de) * 1987-07-15 1993-01-20 Sumitomo Rubber Industries Limited Luftreifen

Also Published As

Publication number Publication date
EP0339335A3 (en) 1990-05-23
JP2650040B2 (ja) 1997-09-03
DE68923478T2 (de) 1995-12-07
EP0339335A2 (de) 1989-11-02
JPH01275202A (ja) 1989-11-02
US4986324A (en) 1991-01-22
DE68923478D1 (de) 1995-08-24

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